Seed Plants
Gymnosperms and Angiosperms
Produce two gametophytes: male and female
Gametophytes consist of only few cells
Seeds: Embryo is protected by layer of sporophyte tissue = ovule
Sporophyte tissue hardens: protect seeds from water loss, heat, grazing
Seeds provide means for distribution and resting stage to overcome unfavorable conditions (drought, freezing during winter, etc.)
Pollen = male gametophytes; whole gametophyte moves towards female gametophyte for pollination/fertilization